Will Home Prices Go Up in Clayton, CA? What Forecasts Say

Photo above: Aerial view of the main and north peaks of Mount Diablo, October 2020. Pi.1415926535, CC BY-SA 4.0, via Wikimedia Commons.

Nobody knows, and you should be wary of anyone who says they do. Zillow’s forecast for Clayton’s ZIP code, 94517, calls for a 1.0% rise by August 31, 2027 (Zillow Research, Home Value Forecast, base date August 31, 2026, checked September 25, 2026), and Clayton’s median sale price is up 3.4% from a year ago (Redfin, Clayton housing market page, August 2026, checked September 24, 2026).

A 1% forecast is a small number, and forecasts are often wrong. Read it as “about flat, could go either way.” Here’s what the record shows, what the forecasters say and what to watch.

What have Clayton prices done over the past year?

Up a little, on a small sample. The median Clayton sale was $1,111,764 in August 2026, up 3.4% from August 2025. Only 33 homes sold that month. The median home sold in 21 days at 100.4% of its list price, and prices ran $487 per square foot (Redfin, Clayton housing market page, August 2026, checked September 24, 2026).

With 33 sales, a few larger homes near the hills can push a monthly median up, and a run of townhomes can pull it down. So a 3.4% change tells you the direction of that month’s sales, not what your house gained.

What does Zillow forecast for Clayton?

Small gains. Zillow Research puts out a ZIP-level outlook each month. Its latest one uses August 31, 2026 as the starting point (Zillow Research, Home Value Forecast, checked September 25, 2026):

Area	By September 30, 2026	By November 30, 2026	By August 31, 2027
ZIP 94517 (Clayton)	up 0.6%	up 1.3%	up 1.0%
San Francisco metro	up 0.4%	up 0.9%	up 1.4%

Two things to know. ZIP 94517 doesn’t follow city lines exactly, so it isn’t a Clayton-only number. And Zillow forecasts its own estimate of a typical home’s value, not sale prices. Notice the forecast rises into November and then gives some back by next August. That’s the kind of wobble that makes any single forecast a weak guide.

What did C.A.R. predict for 2026, and how is it doing?

It called for 3.6% statewide growth, and so far the state is close to flat. C.A.R. is California’s real estate trade association. Its forecast, released September 17, 2025, put the 2026 state median at $905,000 and assumed 30-year mortgage rates would average 6.0% (C.A.R., 2026 California Housing Market Forecast). No 2027 forecast was posted on car.org when we checked on September 25, 2026.

Now the scorecard. C.A.R.’s August 2026 report shows a statewide median of $901,420, just 0.1% higher than August 2025. Rates averaged 6.67% for the month and were above 7.0% by mid-September. The same report says prices typically ease through fall and winter (C.A.R., August 2026 home sales and price report, September 16, 2026). So the forecast’s 6.0% rate assumption was off by two-thirds of a point in August and by a full point in mid-September. That’s normal for forecasts, and it’s why none of them should drive your decision.

What could push Clayton prices down?

Four signals, all public, so you don’t have to take our word for any of them.

Rates over 7%. Every jump in the rate cuts the price a buyer can afford on the same monthly budget. C.A.R., citing Mortgage News Daily, reported rates above 7.0% in the second week of September 2026.
More listings cutting price. About a third of Clayton listings, 34.0%, took a price cut in August 2026 (Redfin, Clayton housing market page, checked September 24, 2026). Watch whether fall pushes that share higher.
Slower sales. Clayton’s median was 21 days on market in August 2026 (same Redfin source). Countywide, C.A.R. counted 20 days in August against 15 in July (C.A.R., August 2026 report). When homes sit longer, sellers usually come down.
Insurance and fire zones. Much of Clayton is mapped Very High fire hazard on the State Fire Marshal’s map dated February 24, 2025, in effect July 10, 2025 (Con Fire, Local Responsibility Area Maps page, checked September 25, 2026). Buyers price in what coverage costs them. How much that matters for one house is something only an insurance quote can tell you.

What is holding Clayton prices up?

Buyers still bid on the well-priced ones. In August 2026, 43.8% of Clayton homes sold above list price (Redfin, Clayton housing market page, checked September 24, 2026). And the county isn’t flooded with listings: C.A.R. measured Contra Costa’s supply at 2.7 months in August, compared with 3.1 months a year before (C.A.R., August 2026 report). Thin supply usually props prices up. Usually isn’t always.

Does the November ballot change the outlook?

It changes a cost, and we won’t guess at the effect on prices. Measure N, on the November 3, 2026 ballot, would extend Clayton’s landscape parcel tax ten years at $354.45 per residential parcel a year starting July 1, 2027, up from $312.84 now, with possible yearly increases capped at 3%. If it fails, the current tax ends June 30, 2027 (City Attorney’s Impartial Analysis of Measure N, checked September 25, 2026). Measure M is a proposed 1% city sales tax, not a property tax (City Attorney’s Impartial Analysis of Measure M, checked September 25, 2026).

We take no position on either measure. For what they mean for your own taxes, ask a tax professional.

Should I wait to buy or sell?

Only if your life says wait. Trying to time a 1% forecast is a coin flip. Ask yourself these instead:

If you’re buying: would this payment still work if the house were worth the same five years from now? Have a lender run it at today’s rate, not last spring’s.
If you’re selling: do you know what homes like yours closed for in the last 90 days? That number is real. The forecast isn’t.

Questions people also ask

Are home prices going down in Clayton, CA?

Not in the latest data. Clayton’s median sale price was $1,111,764 in August 2026, up 3.4% from a year earlier, per Redfin’s Clayton housing market page checked September 24, 2026. But only 33 homes sold that month, and 34.0% of listings had a price drop. A small sample like that can swing, so compare recent sales of homes like yours.

What is the Zillow forecast for Clayton, CA home values?

Zillow Research projects home values in ZIP 94517 up 1.0% by August 31, 2027, starting from August 31, 2026, checked September 25, 2026. It shows 1.3% by November 30, 2026, so the path isn’t a straight line. The ZIP code doesn’t match city limits exactly. Forecasts are often wrong, and a change that small could land on either side.

How do mortgage rates affect Clayton home prices?

Rates set the monthly cost of every offer. When they rise, the same budget buys less house, and sellers feel it. Per C.A.R.’s report of September 16, 2026, the 30-year fixed averaged 6.67% in August 2026 and topped 7.0% by mid-September. On a Clayton median near $1.1 million, a point of rate is a real difference. Ask a lender for your number.

Will Measure N affect home values in Clayton?

No one can say. Measure N would change the landscape parcel tax from $312.84 a year to $354.45 starting July 1, 2027, with possible increases up to 3% a year after that, per the City Attorney’s impartial analysis. If it fails, the tax ends June 30, 2027. We explain the numbers and take no position. A tax professional can tell you what it means for you.

Your next step

Forecasts are guesses. Sales are facts. Send us the Clayton address you care about, yours or one you’re watching, and we’ll show you what similar homes nearby actually closed for. Talk to an agent on our team or call (510) 949-5525.

More on Clayton: How much does a house cost in Clayton right now? · Is Clayton, CA a good place to live? · What’s my home worth?

By Bill Davis, DRE #01880656, The Davis Team at eXp Realty, Clayton, CA. Updated September 25, 2026.

Sources

Redfin, Clayton housing market page, August 2026: redfin.com/city/3609/CA/Clayton/housing-market (checked September 24, 2026)
Zillow Research, Home Value Forecast by ZIP code and metro, base date August 31, 2026: zillow.com/research/data (downloaded September 25, 2026)
C.A.R., 2026 California Housing Market Forecast, news release of September 17, 2025: car.org (checked September 25, 2026)
C.A.R., August 2026 home sales and price report, released September 16, 2026: car.org (checked September 25, 2026)
Contra Costa County Fire Protection District, Local Responsibility Area Maps page and City of Clayton map (State Fire Marshal, February 24, 2025): cccfpd.org/205/Local-Responsibility-Area-Maps (checked September 25, 2026)
City of Clayton, City Attorney’s Impartial Analyses of Measure M and Measure N: claytonca.gov/DocumentCenter/View/841 and /View/844 (checked September 25, 2026)